captioning funded by cbs and ford-- built for the road ahead. >> this is your city. you're enormously proud of it, and these people have done this on patriots day. >> it certainly made me resolve to find these people quickly and to hold them accountable. >> you were going to get them? >> yeah, i was. >> tonight, the story of how they got them and what we've learned about the suspects since. >> he was explaining how the bible is a cheap copy of the koran and how it's used for the american government to... as an excuse to invade other countries. >> nothing can detect a bomb better than the nose of a

working dog. and ever since 9/11, dogs are being used more and more. what can these dogs do on the streets of america? >> the very same thing that they do for our boys overseas. they detect explosives. they are a fantastic deterrent. >> mike ritland knows ab dogs. he trains some of america's finest and gave us a rare glimpse inside the secretive world of the most elite dogs. >> at times like these with the bombs in boston, many of us can't help but be drawn back to the horrific events of september 11th, 2001. about a year from now, at ground zero in new york city, one of the largest and most ambitious memorial museums in the world is scheduled to open its doors. >> just watch your step, leslie. it is a construction site. >> tonight we'll take you for a

first in-depth look at what our nation's 9/11 museum will be. >> i'm steve kroft. >> i'm lesley stahl. >> i'm morley safer. >> i'm bob simon. >> i'm lara logan. >> i'm scott pelley. those stories tonight on "60 minutes." >> cbs money watch update sponsored by: >> . >> glor: good evening. federal budget cuts hit the f.a.a. today with air traffic controllers told to stay home one day every two weeks. apple reports earnings tuesday amid increasing investor concern. the stock is off 40% since september. and gas prices at $3.51 a gallon are down 17 cents in a month. i'm jeff glor, cbs news. [ woman ] i take one prevacid 24 hr for frequent heartburn

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>> pelley: a five-day battle in the war on terror leaves us with a lot of questions. what was the motive for the marathon attack? where did the terrorists plan to strike next with their arsenal of bombs? and how did the manhunt stop them in only a little over 100

hours? tonight, we have the inside story from one of the leaders of that hunt, boston police commissioner ed davis. last monday afternoon, davis was in the stands at the finish line. all was going well, so he left to take a call. one of the city's favorite celebrations was coming to an end. the marathon is alwayse on th day that marks the start of the american revolution, but suddenly ed davis and a task force of more than 4,000 would find themselves defending boston on patriot's day. ( explosion ) when you arrived, what did you see? >> davis: i saw a bombing incident that i'd only seen in places overseas. i saw officer michael barrett from the boston police department wade into an

unbelievable scene of carnage and put the fire out on an individual that was still on fire, and then grab belts off people and put tourniquets on the man's legs so he could save his life. >> pelley: this is your city. you're enormously proud of it. and these people had done this on patriot's day. >> davis: itertainly made me resolve to find these people quickly and to hold them accountable. >> pelley: you were going to get them. >> davis: yeah, i was. >> pelley: you made that promise to yourself. >> davis: i did. and to several other people, too. >> pelley: ed davis' promise was to the three who were killed and more than 170 wounded. the first calls he made were to richard deslaurier, head of the f.b.i.'s boston office, and colonel timothy alben of the state police. the f.b.i. took the lead and the marathon became a sprint. >> davis: very quickly, we established a command post at the westin hotel in the ballroom. and that expanded from about a dozen people when i first walked in the door to 100 people in the first hour.

>> pelley: they found bomb parts right away. evidence cascaded in. >> davis: it's a logistical nightmare. we found very quickly that we needed a place to process this evidence, so a warehouse was obtained. very quickly, computers were brought in from the f.b.i. and the state police and the boston police and set up to review video. >> pelley: among the thousands of faces, they wanted to isolate people who didn't seem surprised. >> davis: and particularly one of the f.b.i. agents who's a technical expert did a tremendous job and really was the person that was able to get to the bottom of this very quickly. >> pelley: look at these people running in terror, but look deeper and see what the agent saw. this kid seems unconcerned. turned out, he came with a backpack but he left without it, just like the older man who

seemed to be with him. and when you saw the faces of those two men, you thought what? >> davis: i thought about the death of the eight-year-old boy, the martin child, and how someonwho di't appear to be particularly el do such an evil thing. >> pelley: they didn't appear all that evil to you in the video? >> davis: no, they looked like college kids. >> pelley: 19-year-old dzhohkar tsarnaev and his 26-year-old brother tamerlan were from a region of russia that's mostly islamic. their ancestors were from chechnya, where islamic militants have fought a vicious civil war against russian rule. around 2002, the family fled as refugees to the united states. >> rose schurtzberg: i can't give you a specific moment when i first met him. he just sort of appeared in my life. >> pelley: rose schootzberg knew dzhohkar at cambridge rindge and latin, a top high school where dzhohkar did well.

you told us at one point that you had in high school a little bit of a crush on him. >> schurtzberg: i yes, i did. how could you not? >> pelley: what was it about him? >> schurtzberg: i think it was that he was equally smart but also humble and, you know, incredibly funny. like, he was he was just an all around wholesome and good person. >> pelley: he fit right in. in 2012, he became a citizen, swearing the oath to protect the united states from enemies foreign and domestic. did he seem overtly religious to you in any way? >> ahmad nassri: not even a little bit. >> pelley: not even a little bit. these friends saw him two weeks ago. he was a sophomore at the university of massachusetts, dartmouth. ahmad nassri and bassel nasri tried without luck to get him to join the m.s.a., the muslim student association. did you see him at mosque? you see him at prayers? nothing like that? >> group: no. >> bassel nasri: no, unfortunately.

>> pelley: unfortunately? >> bassel nasri: i would've loved for him to come to the m.s.a. a few times so he can maybe understand his religion better. maybe that would... that would've helped in what happened, i would say. >> pelley: what was he interested in? >> group: soccer. cars. >> ahmad nasri: if someone a few days ago told me that one of my friends was responsible for the bombs, bombing in boston, i would've named off at least 90% of everyone that i know before i would've said dzhohkar. >> pelley: tamerlan tsarnaev did not fit in easily. a champion amateur boxer, he was disappointed that he couldn't try for the u.s. olympic team because he wasn't a citizen. he lived with his wife and child in this cambridge house, divided into three apartments. al ammon lives there, too, and he says he and tamerlan argued three months ago. >> ammon: he was explaining how the bible is a cheap copy of the koran and how it's used for the american government as an excuse

to invade other countries. and i remember he said that america's a colonial power, trying to colonize the middle east and africa. and he also said that the most casualties in afghanistan and iraq are innocent bystanders gunned down by american soldiers. >> pelley: did he seem angry about all of this? >> ammon: he seemed more passionate about it. he was... >> pelley: passionate about it? >> ammon: yes, yes. he strongly believed what he said. there was tension between both of us. it was more of a really involved discussion. >> pelley: "strong beliefs" was exactly what russian intelligence told the f.b.i. about tamerlan. two years ago, the russians asked the f.b.i. to look into whether he was involved in militant islam. f.b.i. agents interviewed tamerlan and decided he wasn't a threat. still, his pending application for citizenship was held up

because a background check turned up that 2011 f.b.i. investigation. the f.b.i. is now looking into why tamerlan returned to russia recently for about six months. last thursday, when it released the tape, the f.b.i. knew him only as "subject number one," with subject number two following in his footsteps. it was only five or six hours after the videotape was released that events began to unfold rapidly and there was a great deal more violence. >> davis: it's possible that these individuals activated themselves once again because they saw the pictures, because they knew that we would eventually find out who they are. >> pelley: by 10:15 thursday night, officer sean collier was ambushed and murdered in his cruiser. then, gunmen hijacked a car which was spotted by a lone watertown officer. >> davis: at that point, the vehicle stopped. the two suspects alighted from

the area of the vehicle and opened fire on the officer. ( gunfire ) very quickly another officer, richard donohue from the m.b.t.a. police, arrived at the at the scene and also engaged in gun battle. he was shot and grievously wounded. >> police radio: loud explosions, loud explosions, loud explosions! >> davis: the suspects began to log devices at the police, and the first one was a huge explosion. and then the follow-up explions we smaller. but they were improvised hand grenades were being thrown at the officers. >> pelley: the big explosion was a bomb like the ones at the marathon. parts of it were embedded in the patrol cars. the grenades were packed with steel pellets just like the marathon bombs.

( rapid gunfire ) >> davis: the gun battle continued until on the suspects ranutmunion anone of the sergeants tackled him to the ground. pelley: a police officer ran out and tackled him, these men who had armed themselves with so many explosives? >> davis: that's correct. that's what happened. it probably would not be advised as a tactical move, but it shows the courage and commitment that officers have in attempting to get this thing under control. >> pelley: he was going to put the guy down before he had a chance to reload, and risk his own life to do it. >> davis: right. he saw an opportunity and he took it. >> pelley: tamerlan tsarnaev was down, dying from multiple gunshot wounds. the younger brother gets in the car, backs over his older brother, drives away. what happened then? >> davis: the suspect that fled abandoned the vehicle four blocks... four or five blocks away and took off on foot. we determined that a 20-block perimeter had to be set up. >> pelley: and so began the lockdown of the city of boston.

>> do not open the door unless there is a yiewrmd, identified law enforcement officer on the other side. >> pelley: the tsarnaev apartment was raided. they found bombs inside and wondered what plans the brothers had for those. the 20 block search lasted 15 hours, and then davis announced that they had lost the suspect. >> davis: there was extreme frustration and disappointment in the command post. >> pelley: and it was not, what, 30 minutes later... >> davis: it was probably close to 15 minutes later. >> pelley: that a man called 911. he went into his backyard where he has a boat with a cover over the top, and he saw the cover was torn. >> davis: right. he said he was dying for a cigarette. he had to go outside to have his cigarette, and he saw the blood on the boat. and so, he peered in after climbing a ladder. and he told me that he saw a body in there with blood on it.

>> davis: a gunshot was heard and officers returned fire. the order was given to cease fire. we then pulled the state police helicopter in, which has a forward looking infrared device on its nose. and it was able to come in and actually look through the plastic on the boat and see the suspect inside. >> george macmasters: my thought when i first heard those 20 rounds was that he was already dead. >> pelley: neighbor george macmasters hrdt all from his home nearby. >> macmasters: the thought that he'd been killed, just to me is, you know, one more tragedy because the last pictures i saw, he's an older face, and that's not the face i remember. >> pelley: macmasters had once hired dzhohkar as a 16-year-old lifeguard. if dzhohkar is the bomber, macmasters has a question. >> macmasters: "how in the world did this happen?" you know, how could he have been changed so much in the year, year and a half that i've been absent; go from a young man that... polite, well-spoken, friendly, engaging, typical

american teenager to what i have to say is a monster? >> pelley: his question is one of the mysteries. though his friends didn't see it, we know dzhohkar was failing in college. something had changed. an f.b.i. negotiator talked him out of the boat. he had been shot in the leg the night before. >> s.in custody. no one is to enter the perimeter. >> pelley: they treated him for a gunshot wound through the mouth that exited the back of his neck. whether that was a suicide attempt, davis won't say. do you think he's going to pull through? >> davis: i wouldn't comment. >> pelley: but the wounds are serious enough that there's a chance that he might not? >> davis: they're very serious wounds. ( cheers and applause ) >> pelley: on saturday, at fenway, the red sox honored the innocent people who were lost and wounded and the army of 4,000 who were part of the investigation. in boston, of course, this is a

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spiriva helps me breathe better. does breathing with copd weigh you down? don't wait to ask your doctor about spiriva. >> logan: when the bombs went off at the boston marathon, highly trained dogs were rushed to the scene to search for more explosives. boston police have said dogs swept the streets in the morning and a second time just an hour

before the first marathoners crossed the finish line. red ckely that the bombers planted their devices well after toged sweeping the area. since 9/11, dogs have been used more than ever because nothing has proven more effective against hidden bombs than the nose of a working dog. the best of them serve with u.s. special operations, and they're in a league of their own. it's nearly impossible to get anyone to talk about them publicly because much of what they do is classified, but we were able to talk to the people who train them for this story. we took the opportunity to ask about what might have happened in boston while getting a rare glimpse inside the secretive world of america's most elite dogs. green beret chris corbin and his dog, ax, are at 14,000 feet in the skies over north carolina.

they're about to test a new harness that america's best iersill use to jump into combat. but it's not for corbin, it's for ax. as they free-fall for nearly 10,000 feet at 125 miles an hour, ax is wrapped in corbin's arms. they've been to war together, nearly died together, and they never like to be too far apart. do you think he enjoyed it? >> corbin: he just wants to do whatever i'm doing. he doesn't care what it is. >> logan: you've said that these dogs feel like they're invincible? >> corbin: absolutely. >> logan: what makes you say that? >> corbin: we don't train them to fail. >> logan: sergeant first-class corbin is a dog handler with 7th special forces group, and he and six-year old ax have been a team for three years. they deployed to helmand in southern afghanistan at a time when more americans were dying there than any other place in the country.

corbin and ax's job was to lead their unit through a battlefield littered with hidden bombs. >> corbin: we walked in front. we cleared the pass for... for everyone to move through. >> logan: you say it so easily-- "i walked out front"-- like it's nothing, but what does that actually mean when you're the one walking out front? >> corbin: you are the one risking... i hate to s the most, but, yeah, you're out front. i'm the one who makes it safe or announces it as safe for everyone else to walk behind. >> logan: what's your level of trust in your dog? >> corbin: it has to be this perfect trust. >> logan: perfect trust that begins with trainers like former navy seal mike ritland. he's one of just a handful of people in this country who finds and trains these dogs for special operations and top tier units in the f.b.i. and police departments across the u.s. what can these dogs do on the streets of america?

>> ritland: the... the very same thing that they do for... for our boys overseas, in that they... they detect explosives. they are a fantastic deterrent. they use their nose to find, you know, people as, well. >> logan: would an average police dog have found these bombs at the boston marathon if they'd already been placed on the ground, you theykn, ere sweeping through there? >> ritland: there is a lot variables at i'm not awaref as to where they were and what was done in terms of the sweeps. but, based on what i do know, yes, if... if dogs went through the areas where... where they were placed, you know, your... your average, certified police bomb dog should have found them. my thoughts are, if... if these guys are paying close attention to these dogs, they're waiting. and when the dogs leave, they bring it in. they hand... they hand... they infiltrate, essentially. they drop it right where it's busy, and, very soon after, it detonates. >> logan: mike ritland knows from his own experience on the ground in iraq what it means to have one of these elite dogs on your team.

>> ritland: when you step outside that wire... >> logan: like, outside the base? >> ritland: outside the base, it's crossing the border to hell on earth. every step you take is that same feeling of, "the very next step that i take may be my last." when you see these dogs operate in the capacity that they can, using their nose and finding explosives in... in the manner that they do, the... the... that level of comfort absolutely skyrockets in your mind because you know that you've got one of the... the best-trained, best- equipped, best-capable, you know, working dogs out in front of you that... that has your back. >> logan: we met mike ritland on his 20-acre ranch in rural cooper, texas, where he runs his own company. tell me some of the things that these dogs can actually do. they jump out of planes? helicopters? >> ritland: you can free-fall with 'em. you can rappel with them.

you can fast-rope with them. you can swim with them. i mean, they can ride on boats. they can ride on your back. there's not really an environment that we operate in that... that you can't bring a dog. logane's su a demand for themt itland says they'd be used on almost every mission if there were enough of them. and it's not just about their nose. ritland is training this dog rico to track humans and take down enemy fighters. he's three and a half years old, and ritland has been working with him for the past year. here, he's about to apprehend a suspect. these dogs can run faster than 30 miles an hour. the suspect is one of mike ritland's partners, and he's screaming to make this as realistic as possible. these dogs are trained to capture, not to kill. >> ritland: there's no human

being on earth that can outrun them. you know, i can tell you that the physical capability of these dogs is impossible to explain hard evento comprehend when you see it. >> logan: how hard can they bite? >> ritland: hard enough to break bones. i had a dog bite me right here, like this. he only had his mouth on me for probably four or five seconds and broke my wrist. >> logan: he broke your wrist in four or five seconds? >> ritland: yeah. i mean, just like that, just broke it. >> logan: mike ritland says they have to teach these dogs how to deal with someone who wants to harm them. the trainer is putting pressure on him without hurting him. the aim is to make the dog comfortable, then teach him to ignore it, and, by the end, ritland says, the dog won't let it affect him at all. >> ritland: the number one thing that i look for in a dog is that that dog, when pushed, and when he's put into an uncomfortable spot where physically and mentally he's got pressure on him and i give him the choice-- and it's absolutely a choice to

either stay and fight me or to quit and run-- that dog decides "i'm going to stay and fight you, and i'm gonna beat you." when you do find that, it is a unicorn in that they almost don't exist. >> logan: arko is one of those rare dogs. he's retired after repeated deployments to iraq and afghanistan, and he now lives on mike ritland's ranch. most of what he's done is classified, so ritland could only tell us a little about the operation that almost killed him when he took down an enemy fighter who shot him in the chest. >> ritland: and he maintained control of the guy, you know, after being... after being shot, so... >> logan: at point-blank range? >> ritland: uh-huh. yep. so, you know, it's funny because a lot of... a lot of people, you know, i think scoff at the idea that, you know, what kind of... what... what kind of things, what kind of obstacles can these dogs really go through, you know?

and it's... it's more than most humans. ( growling ) >> logan: for a dog to make it in the world of special operations, mike ritland says there are certain qualities that have to be there from the beginning. >> ritland: he's already, you know, displaying the prey drive and possessiveness that we like to see in that he'll put uncomfortable objects in his mouth. >> logan: most of the dogs that do this work well are from one breed, belgian malinois. and there are only three places in the u.s. that breed them for top-tier military units like this one in west virginia, where mike ritland gets some of his dogs. oh, they're so cute. here, they specialize in the early stages of training, which starts almost from birth with loud noises that are meant to get them used to the sounds they may one day face in combat. their noses are up to a 1,000 times more sensitive than a

human's, and at just a few months old, they start learning to ignore other smells and distractions while zeroing in on the scent of a bomb. >> ritland: so, here she's trying to get her to be disobedient to that odor, and he won't do it. >> logan: they'll repeat this training over and over for two years so that by the time this dog goes to war or is needed on america's streets, nothing will take it off the track of a bomb. >> ritland: everybody knows that dogs can smell better than humans, but what they don't realize is that if you and i walk into the kitchen and there's a pot of beef stew on the counter, you and i smell beef stew. a dog smells potatoes, carrots, beef, onion, celery, gravy, flour. they smell each and every individual component of everything that's in that beef stew. and... and they can separate every one of those. you can't hide anything from them. it won't work because you can't fool a dog's nose. >> logan: dogs and their handlers work as a team, and

they go through so much together, their bond is as strong as a band of brothers. green beret chs corb andx almost died together in afghanistan on their final mission. corbin says everything was going right that day, and ax had already found one bomb. they moved together to an area that had been cleared, and that's when he says he missed ax's signal. >> corbin: all of a sudden, he wasn't pulling forward, he was pulling down. i was, "what are you doing buddy? hold still." i wasn't thinking it... maybe he's sniffing my foot, maybe i passed by a dog-- all these other things why he would be looking down. and i looked down, and he was just intently sniffing all around my foot. and it started to occur to me that, okay... >> logan: wait a minute. >> corbin: with wires coming out of the building, we're already in a place that we know is full of mines, why is he sniffing down on my foot? and at that moment, it was just that, too little too late. and that was it. >> logan: ax was shaken up by the blast but not wounded.

chris corbin lost both his lower legs. yet, in less than five months, he was back on active duty as a green beret. he says ax had a lot to do with it and described the moment he saw him again for the first time. >> corbin: they brought him up for a visit, and i heard him getting him out of the back of the truck and opening his kennel. and he, just being a stir-crazy dog, just, "hey, let me out of here, let's do a look around." i just said something simple. "hey, where's my boy at?" and he stopped, he froze, he looked around, and he went into a panic until he found me and he jumped on my legs. painful. just... i was just happy to see him. i didn't care how much it hurt. >> logan: during our entire interview, ax never left corbin's side and barely took his eyes off him. corbin says he's fearless because he doesn't know when he's in danger. some people might say, "well, that's unfair to the dog because you're sending this dog into a dangerous environment where he could very easily lose his life or limbs, be wounded, and he doesn't understand."

aredorbin: i could make him scf it and make him not do his job and send soldiers to the same death. that's my answer to that. >> logan: it wasn't until after 9/11 that special operations formally began using dogs, starting in afghanistan. duane and his dog rex survived a tough deployment there in 2010. >> duane: i saw my dog, you know, trying to smash through doors, climb up cliffs, drag people down cliffs. just track people, find odors that were hid... hidden up in the ceiling, just you name it. it... it seemed like every day i was being amazed by these dogs. >> logan: duane has been a covert operator for 21 years. he told us these dogs are so effective, they're now being targeted. a taliban commander told a member of our team that on his last operation, they were ordered to open fire on the

american dogs first and deal with the soldiers next. in afghanistan, there have been 42 dogs killed in action, and when they are wounded in combat, they get the same care as any soldier. and when these dogs retire from special operations, some of them-- like rex, duane's dog-- find jobs with law enforcement. he's now working with the san diego sheriff's department. those who can't work anymore often end up with mike ritland, who's started the warrior dog foundation to look after them. ritland is the first person to write a book about these elite dogs. he says when budgets are being cut, he hopes people won't forget how much a well-trained dog like rico means on today's battlefield and on our city streets. and he's your dog? >> ritland: right now, he is, yeah. ( laughs ) that's always subject to change,

but, you know, he's... he's better served serving our country than he is being... being my personal dog. so, you know, when the... when the time comes for him to... to answer that call, i'd... i'd... i'm always happy to see them go... go do something for the greater good. ♪ [ lighter flicking ] [ male announcer ] you've reached the age where giving up isn't who you are. ♪ this is the age of knowing how to make things happen. so, why let erectile dysfunction get in your way? talk to your doctor about viagra. 20 million men already have. ask your doctor if your heart is healthy enough for sex. do not take viagra if you take nitrates for chest pain; it may cause an unsafe drop in blood pressure. side effects include headache, flushing, upset stomach, and abnormal vision. to avoid long-term injury, seek immediate medical help for an erection lasting more than four hours. stop taking viagra and call your doctor right away

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>> stahl: at times like these, with the bombs in boston, many of us can't help but be drawn back to the horrific events of september 11, 2001. about a year from now, at ground zero in new york city, one of the largest and most ambitious memorial museums in the world is scheduled to open its doors to tell the story of that day, the national september 11 memorial museum. it'll actually be located below ground, seven stories down. it's a project that's been plagued by delays, by funding battles, even a flood thanks to hurricane sandy.

but if you can believe it, those things were the easy part. the bigger challenge: how do you convey the horror of 9/11 without making it unbearable? memorialize a day most of us wish we could forget? tonight, we'll take you down below for a first in-depth look at what our nation's 9/11 museum will be. ground zero above ground is today a place of rebuilding and remembrance. at its center is a serene memorial plaza with two giant cascading pools, twin voids set into the footprints where the towers of the world trade center once stood. each pool is surrounded by names-- 2,983 of them-- plus some who didn't even have a name. it's quiet and powerful as people come-- over seven million so far-- to touch and feel and, in some cases, mourn fathers, sisters, children.

but you won't find anything here about what actually happened on 9/11; nothing about the buildings, the planes, nothing about the terrorists. all that will be the job of the museum and its director, alice greenwald. >> alice greenwald: we occupy literally the space below the memorial plaza. >> stahl: so, we're walking... >> alice greenwald: you're walking on the roof of the museum. >> stahl: this is not greenwald's first job on a project about a painful subject. she came here from the holocaust museum in washington, d.c. >> alice greenwald: just watch your step, lesley. it is a construction site. >> stahl: but at this construction site, the issues go far beyond where to put the walls. virtually every decision here is fraught with meaning as you descend past two 50-ton beams recovered from the wreckage into a space... >> alice greenwald: welcome to foundation hall. >> stahl: ...that takes your breath away. ( gasps ) it's haunting and a little chilling knowing you're in the

belly of ground zero, in the place where so many innocent people lost their lives. so, here we are. we're right where the buildings collapsed. we're in it. >> alice greenwald: most museums are buildings that house artifacts; we're a museum in an artifact. >> stahl: where we are is almost sacred. >> alice greenwald: i think you are become super conscious of where you're standing, and that's a powerful thing. it's a very powerful thing. >> anthoula katsimatides: it's the authentic site of loss. >> monica iken: it is... it is sacred and hallowed space. >> stahl: we spoke with four family members who are also members of the museum's board. paula grant berry's husband david worked in tower 2, as did monica iken's husband, michael. anthoula katsimatides' brother john was in tower 1; and tom rogeér's daughter jean was a flight attendant on american airlines flight 11. >> paula grant berry: the site radiates something for us all in a very special way. >> monica iken: that's where the final resting place of our loved ones is. >> stahl: it has to be there? >> monica iken: it has to be there.

>> voices: has to be there. >> anthoula katsimatides: yes. >> monica iken: and you can feel it. >> alice greenwald: this is the remnant of the exterior structure that made up the twin towers. >> stahl: one of greenwald's first challenges in this hallowed space was deciding where the story of 9/11 should begin. >> alice greenwald: we begin with the voices of people from around the world, remembering where they were when they heard about the attack. >> someone barged in and said, "oh, my god, a plane has just crashed into the world trade center." >> stahl: the idea is to acknowledge that most visitors will bring their own memories of 9/11, which was witnessed within hours by people all across the globe. >> phone rang, woke me up. my business partner told me to turn on the television >> stahl: greenwald says we are all survivors of 9/11, so it's fitting that visitors will descend to the main exhibits of the museum beside an enormous staircase, now encased in wood, that served as an escape route. >> alice greenwald: on 9/11, hundreds of people ran to safety down this stair.

>> stahl: the so-called" survivor staircase" is one of several artifacts so big, the museum had to be built around them-- like this fire engine lowered in through a hatch in the roof that will honor first responders, 441 of whom lost their lives; and the famous last column, the final, massive e.mnant of the towers to behe s but we found that some of the most powerful things on display here... okay, so that's flight 11. >> alice greenwald: takes off from boston. >> stahl: ...won't be physical artifacts at all. oh, look, the second plane. a large projection on the wall will show the morning of 9/11 as it played out in the air... >> alice greenwald: flight 11 is hijacked. meanwhile, flight 77 leaves. >> stahl: ...with the simultaneous flight paths of the

four planes. >> alice greenwald: and now, flight 93 takes off. impact has already happened in new york. >> stahl: oh, look at this. >> alice greenwald: and then, flight 93 is hijacked, turns around. >> stahl: among the agonizing decisions for the museum: should they include the voicemail messages left by passengers aboard those planes, and other victims of 9/11, for their loved ones? one advisor told greenwald to think of these recordings as a form of human remains. >> alice greenwald: what he said-- and i've never forgotten it-- is that sound can be a more emotional form of communication because you hear the timbre of the human voice. >> baby, you have to listen to me carefully. i'm on a plane that's been hijacked. >> stahl: they plan to include a few recordings, seek permission from family members and use them only with a purpose-- this one, from flight attendant ceecee lyles to her husband-- as a testament to the professionalism of the hijacked crews. >> there are three guys; they've hijacked the plane. i'm trying to be calm. >> alice greenwald: she is so composed. >> stahl: she's in flight attendant mode. >> alice greenwald: she's in flight attendant mode. and at the very end of the call, she says something like, "i hope i see you again, baby."

>> i hope to be able to see your face again, baby. i love you. bye. >> stahl: oh, my goodness. and, of course, audio is just the beginning of the sensitive questions about what should be exhibited. let me ask you, what about some of the horrific shots, for example, of people jumping? >> alice greenwald: this is probably, as far as i'm concerned, the most sensitive question for this museum. >> joe daniels: we went through a lot of debate internally about, "do we show that side of the story?" >> stahl: on the morning of september 11, joe daniels came out of the subway to the gruesome sight of bodies falling from the north tower. today, he is president of the 9/11 memorial and museum. >> joe daniels: you never want to have to see that; someone 100 stories up, 1,000 feet in the air, having to make that kind of choice. on the same time, there's a very strong feeling that this was a part of the story; that a group of people from this group, al

qaeda, put innocent people in a position to have to do that. >> stahl: when you think about what terrorism means, this really says it. >> alice greenwald: absolutely. it's an impossible thing for a human being to do to another human being, and yet it became possible on 9/11. so, for us not to acknowledge that would be to not be true to the story. >> stahl: but how? with video of people falling, or photographs? and what about the feelings of family members? greenwald told us that she knows that some will never want to see an exhibit on this subject, but many argued strongly that it had to be there. >> alice greenwald: i have to say that we were also... i... i don't want to say accosted-- that's a little strong-- but, you know, shaken by the lapels by family members who said, "you have to tell the story. don't whitewash the story. tell it like it was. the world needs to know." >> joe daniels: so, we

ultimately decided that we will include an exhibit, but do it in a way, in an alcov where people will be clearly warned. and if ty don'ntse or have their family see it, they can easily avoid it. >> stahl: one exhibit they want everyone to see is what greenwald calls the heart of this museum, a space devoted to honoring the victims lives with photographs of each of them lining the walls. those giant walls out there go all the way up. every bit of space will be covered... >> alice greenwald: right. >> stahl: ...with faces? >> alice greenwald: yes. the impression will be that you are surrounded by nearly 3,000 faces. >> stahl: these are the photographs that will cover those walls. look at those faces. look at all those faces. >> alice greenwald: they're ages two and a half to 85, from over 90 countries, every sector of the economy, every possible ethnic group. >> stahl: visitors will be able to search these interactive tables and call up profiles of each person, with photos and recorded remembrances by family members and friends like this

one by the father of paul acquaviva, who died in tower 1. >> mr. acquaviva: he never had a bad word, literally, to say about anybody. he always looked at the positive. you know, i know, to be honest with you, he didn't get it from me because i'm very critical at times. to me, that was one of the most important things about paul. >> alice greenwald: some of them are funny. some of them are sweet. and we're not telling you who they are; their loved ones are telling you who they are. >> stahl: visitors can also search by birthplace or by company. >> alice greenwald: if i call up cantor... >> stahl: cantor fitzgerald was the company that lost more employees than any other. >> alice greenwald: 658 people... >> stahl: look at that. >> alice greenwald: ...who died on 9/11 at cantor fitzgerald. >> stahl: from that one company. one of the 658 was john katsimitides, anthoula's brother. >> anthoula katsimatides: so, there's four of us growing up-- george, john, myself and michael. >> stahl: we were there the day she brought photos to contribute to john's profile to the museum's chief curator.

>> jan ramirez: well, that is just so cute. >> anthoula katsimatides: i know. >> lesley stahl: what's it like to go through the photographs and choose? >> anthoula katsimatides: i had an extremely difficult time doing that because, you know, you see him as a child growing up, you know, and then as a best man in all of his best friends' weddings. so, it's like, well, which one do you pick? because you just are so sad that the pictures stop here. >> stahl: families members all share the devastation of their loss, but the museum discovered that they are hardly a monolithic bloc. >> alice greenwald: it's the families of nearly 3,000 people. it's, you know, probably 10,000, 20,000 people, all of whom have their own perspectives, their own desires, their own ideas about what kind of museum should be here. >> stahl: was absolutely every single tiny little thing an argument? >> paula grant berry: there were lots of issues. >> monica iken: oh, boy. ( whistles ) lots, lots. >> stahl: like whether to exhibit pictures of the perpetrators.

and what about osama bin laden? do they belong in the 9/11 museum? well, what was the argument for not showing osama bin laden? >> joe daniels: that on this... this actual ground where the atrocity took place, this graveyard to some extent, how could you demean the memory of my loved one by showing the image of the person that murdered him? >> stahl: but other family members took the opposite view, demanding accountability. >> anthoula katsimatides: it was absolutely important to point fingers. >> monica iken: you have to tell the story. >> anthoula katsimatides: you know, we had to express who did this to our loved ones. >> joe daniels: we don't want any child or adult or student to walk through this museum and not leave knowing who did this to us, which is why we're going to go ahead and show those images. >> stahl: but the museum also wants people to know the stories of heroism and selflessness, the spirit of unity after the

attacks, so there will be tributes here to recovery workers and volunteers. by the time this museum opens its doors next year, virtually no one under the age of 17 will have a first hand memory of september 11, 2001. for almost a quarter of the population, 9/11 will not be a searing memory; it will be, well, something to learn about in a museum. >> anthoula katsimatides: we are worried about the children who don't remember 9/11. and this is the way to tell exactly what happened to future generations so no one ever forgets. >> stahl: even the painful, maybe most particularly the painful? >> paula grant berry: right. >> anthoula katsimatides: we're not talking about a simple little happening, you know. we're talking about a brutal attack on our country, you know, where 3,000 people were innocent. and they were murdered that day. we went out and asked people a simple question: how old is the oldest person you've known? we gave people a sticker and had them show us. we learned a lot of us have known someone who's lived well into their 90s.

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